Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b83759ebae2033f…

MALICIOUS

PDF

74.5 KB Created: 2021-02-06 00:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 03324a973c9e3c4fc810300475487801 SHA-1: ba1227442faaa432850af9bfb2108b5235299d3b SHA-256: 4b83759ebae2033f910e7bcc5193cde36d9627c52a0420f36e04696b58b070a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=four+corner+hustlers+lit'. Machine learning classification also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within the document body suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=four+corner+hustlers+lit In PDF document text
    • https://static.s123-cdn-static.com/uploads/4465907/normal_60007b14ef3d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403959/normal_5fed7d92f0d36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464722/normal_60037b5223757.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/8CPrcih/hocus_pocus_witch_house_tour.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6019f759677e6.pdfIn PDF document text
    • https://cdn.sqhk.co/gipudeviwapi/ghBX0Y4/glass_water_bottle_price_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/5DVCdhc/moridaturox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_5fe925f802488.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/wR8jbEy/limit_screen_time_control_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fece58db44be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadedosi/stanley_backpack_sprayer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/vumewipi.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/adobe_animate_cc_2017_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/78633154258.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/ccna_200-_301_study_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 4632 bytes
SHA-256: 2a589a2b3f5bf7c0facacffa79697efaf54bdf03702b77d0764dc7c64443d40c
font_01_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 10468 bytes
SHA-256: 95465db299fd81b11a2037c38eefd5f08975ee3879b1bb267ab67b78288da0ca

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